The white faced bear is a model by Daniela Carboni. She says to make it with mono-colored paper, but I think the two tone works very well, since it seems to delineate the face. It captures very well the huge, shambling feel of a big grizzly.

The white footed bear is from KASAHARA Kunihiko's Creative Origami. His is cuter, so I think of it as a cub.